HPSOV L :
I haven't seen any speculation about whether the low energy state was even recoverable from the point where it was detected. Or to put it another way; given the aircraft is at the correct speed and position at 500' (notwithstanding that the Thrust Levers were at Idle), how long is the window for detection before the situation is unrecoverable?
Interesting question, (assuming the nominal at 500' is corect), to paraphrase:
How long did it take the for the speed display to go from nominal to an -alarmingly- low value and what margin was then available from that point to recover?
A complementary question would be "what was the pilots scan rate" and given that rate for how many scans would an alarming speed value be displayed?
I am also wondering if the speed tape includes a "trend" indicator or just absolute value, "132 : dropping fast" might be more noticeable than a plain "132".